Reynolds Number in Duct Calculator

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Parameters of Ducts

Continuity Equation for Ducts

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Pressure Loss in Ducts

✖Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.ⓘ Diameter of Circular Duct [d]			+10% -10%
✖Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0.ⓘ Mean Velocity of Air [V_mean]			+10% -10%
✖Kinematic Viscosity is a measure of a fluid's internal resistance to flow under gravitational forces.ⓘ Kinematic Viscosity [υ]			+10% -10%

✖The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.ⓘ Reynolds Number in Duct [Re]

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Formula

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Reynolds Number in Duct

Formula

`"Re" = ("d"*"V"_{"mean"})/"υ"`

Example

`"0.0015"=("0.01m"*"15m/s")/"100m²/s"`

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Reynolds Number in Duct Solution

STEP 0: Pre-Calculation Summary

Formula Used

Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity
Re = (d*V_mean)/υ
This formula uses 4 Variables

Variables Used

Reynolds Number - The Reynolds number is the ratio of inertial forces to viscous forces within a fluid which is subjected to relative internal movement due to different fluid velocities.
Diameter of Circular Duct - (Measured in Meter) - Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.
Mean Velocity of Air - (Measured in Meter per Second) - Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0.
Kinematic Viscosity - (Measured in Square Meter per Second) - Kinematic Viscosity is a measure of a fluid's internal resistance to flow under gravitational forces.

STEP 1: Convert Input(s) to Base Unit

Diameter of Circular Duct: 0.01 Meter --> 0.01 Meter No Conversion Required
Mean Velocity of Air: 15 Meter per Second --> 15 Meter per Second No Conversion Required
Kinematic Viscosity: 100 Square Meter per Second --> 100 Square Meter per Second No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

Re = (d*V_mean)/υ --> (0.01*15)/100

Evaluating ... ...

Re = 0.0015

STEP 3: Convert Result to Output's Unit

0.0015 --> No Conversion Required

FINAL ANSWER

0.0015 <-- Reynolds Number

(Calculation completed in 00.005 seconds)

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< 8 Parameters of Ducts Calculators

Equivalent Diameter of Circular Duct for Rectangular Duct when Quantity of Air is Same

Go Equivalent Diameter of Duct = 1.256*((Longer Side^3*Shorter Side^3)/(Longer Side+Shorter Side))^0.2

Equivalent Diameter of Circular Duct for Rectangular Duct when Velocity of Air is Same

Go Equivalent Diameter of Duct = (2*Longer Side*Shorter Side)/(Longer Side+Shorter Side)

Reynolds Number in Duct

Go Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity

Quantity of Air given Velocity

Go Quantity of Air = Velocity of Air*Cross-Sectional Area of Duct

Velocity Pressure in Ducts

Go Velocity Pressure in Ducts = 0.6*Mean Velocity of Air^2

Friction Factor for Turbulent Flow in Duct

Go Friction Factor in Duct = 0.3164/Reynolds Number^0.25

Reynolds Number given Friction Factor for Laminar Flow

Go Reynolds Number = 64/Friction Factor in Duct

Friction Factor for Laminar Flow in Duct

Go Friction Factor in Duct = 64/Reynolds Number

Reynolds Number in Duct Formula

Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity
Re = (d*V_mean)/υ

What is Reynolds number?

Reynolds number is defined as the ratio of the inertia forces to the viscous forces. It may be noted that the Reynold number is a dimensionless quantity and gives us information about the type of flow (i.e. *laminar or turbulent).

How to Calculate Reynolds Number in Duct?

Reynolds Number in Duct calculator uses Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity to calculate the Reynolds Number, The Reynolds Number in duct formula is defined as the ratio of the inertia forces to the viscous forces. Reynolds Number is denoted by Re symbol.

How to calculate Reynolds Number in Duct using this online calculator? To use this online calculator for Reynolds Number in Duct, enter Diameter of Circular Duct (d), Mean Velocity of Air (V_mean) & Kinematic Viscosity (υ) and hit the calculate button. Here is how the Reynolds Number in Duct calculation can be explained with given input values -> 0.0015 = (0.01*15)/100.

FAQ

What is Reynolds Number in Duct?

The Reynolds Number in duct formula is defined as the ratio of the inertia forces to the viscous forces and is represented as Re = (d*V_mean)/υ or Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity. Diameter of Circular Duct is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere, Mean Velocity of Air is defined as the time average of the velocity of a fluid at a fixed point, over a somewhat arbitrary time interval T counted from some fixed time t0 & Kinematic Viscosity is a measure of a fluid's internal resistance to flow under gravitational forces.

How to calculate Reynolds Number in Duct?

The Reynolds Number in duct formula is defined as the ratio of the inertia forces to the viscous forces is calculated using Reynolds Number = (Diameter of Circular Duct*Mean Velocity of Air)/Kinematic Viscosity. To calculate Reynolds Number in Duct, you need Diameter of Circular Duct (d), Mean Velocity of Air (V_mean) & Kinematic Viscosity (υ). With our tool, you need to enter the respective value for Diameter of Circular Duct, Mean Velocity of Air & Kinematic Viscosity and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Reynolds Number?

In this formula, Reynolds Number uses Diameter of Circular Duct, Mean Velocity of Air & Kinematic Viscosity. We can use 1 other way(s) to calculate the same, which is/are as follows -

Reynolds Number = 64/Friction Factor in Duct

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